ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C20H18O4/c1-13(21)17(19(23)15-9-5-3-6-10-15)18(14(2)22)20(24)16-11-7-4-8-12-16/h3-12,17-18H,1-2H3/file?format=sdf&get3d=True  -- InChI=1S/C20H18O4/c1-13(21)17(19(23)15-9-5-3-6-10-15)18(14(2)22)20(24)16-11-7-4-8-12-16/h3-12,17-18H,1-2H3 could not be loaded.